PlainFlights

Route · STL → RDU · 2020–2025 BTS data

St. Louis to Raleigh/Durham

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), STL to RDU (St. Louis to Raleigh/Durham) ranks #3604 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

84%
On-time
+5 pts
vs US avg
55 min
Delay when late
2,360
Flights
#3604 of 4927
Corpus placement

Cancelled

0.4%

Best Month

Mar 2025 93%

Worst Month

Jul 2024 71%

Distance

667 mi

Carriers

1

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 60 9 0 0 WN
Nov 2025 58 12 0 0 WN
Oct 2025 58 15 0 0 WN
Sep 2025 52 8 0 0 WN
Aug 2025 53 6 0 0 WN
Jul 2025 58 12 0 0 WN
Jun 2025 56 16 0 0 WN
May 2025 56 6 0 0 WN
Apr 2025 57 11 0 0 WN
Mar 2025 58 4 0 0 WN
Feb 2025 36 4 0 0 WN
Jan 2025 37 6 3 0 WN
Dec 2024 60 10 0 0 WN
Nov 2024 56 4 0 0 WN
Oct 2024 58 5 0 0 WN
Sep 2024 55 5 0 0 WN
Aug 2024 59 6 0 0 WN
Jul 2024 62 18 0 0 WN
Jun 2024 59 11 0 0 WN
May 2024 58 10 0 0 WN
Apr 2024 55 5 0 1 WN
Mar 2024 48 8 0 0 WN
Jan 2024 32 7 2 0 WN
Dec 2023 39 10 0 0 WN

STL–RDU seasonal on-time pattern

Best: March (90.2%) · weakest: June (74.2%)

70%75%80%85%90%95% JanFebMarAprMayJunJulAugSepOctNovDec 81.6%

Strongest calendar month

March

90.2% on-time · ~46 flights/mo

Busiest calendar month

October

~48 flights/mo avg

Weakest calendar month

June

74.2% on-time · ~42 flights/mo

Cancellation Rate

0.4%

5 of 1,280 flights

Diversion Rate

0.1%

1 of 1,280 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

STL - St. Louis

Full on-time, delay-cause, and seasonal performance for St. Louis, MO.

STL on-time profile

RDU - Raleigh/Durham

Full on-time, delay-cause, and seasonal performance for Raleigh/Durham, NC.

RDU on-time profile

Compare the two airports

See STL and RDU side by side on delays, cancellations, and reliability.

Compare STL vs RDU

Origin-hub reliability standing

Mid-pack among STL departures

From STL, this corridor sits with 45 other 75–85% on-time routes out of 51 tracked departures, not the hub's reliability leaders (5 at ≥85%) and not the softest ( 1 below 75%). Destination: Raleigh/Durham · fleet on-time rank #1595 of 4927.

What the Data Says About STL to RDU

Bureau of Transportation Statistics records show St. Louis to Raleigh/Durham (STL to RDU) running a 84% on-time rate over 2,360 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 55.4 minutes. The 667-mile corridor is served by 1 carrier, and over the last 24 months 0.4% of 1,280 flights were cancelled, 0.1% diverted.

The monthly split is wide on this route: Mar 2025 posted the strongest performance at 93% on-time, while Jul 2024 came in at just 71% - a 22-point swing worth factoring into travel timing.

On the multi-year calendar, STL–RDU peaks in March at 90.2% on-time while October carries the heaviest traffic (~48 flights per month) ; the softest month is June at 74.2%, a 16.0-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does STL to RDU rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, STL to RDU ranks #3604 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from STL to RDU? ▼
Flights from St. Louis to Raleigh/Durham have a 84% on-time rate based on 2,360 flights. The average delay is 55.4 minutes. The best recent month was Mar 2025 with 93% on-time.
What is the cancellation rate for STL to RDU? ▼
Over the last 24 months, 0.4% of flights on this route were cancelled (5 of 1,280 flights) and 0.1% were diverted.
How far is the flight from STL to RDU? ▼
The flight distance from St. Louis (STL) to Raleigh/Durham (RDU) is approximately 667 miles. This route is served by 1 carrier.
When is the best time to fly from STL to RDU? ▼
The best recent month for on-time performance was Mar 2025 (93% on-time). The worst was Jul 2024 (71% on-time). Consider booking during months with historically better performance.

Airports on this route

STL Airport

St. Louis
RDU Airport

Raleigh/Durham
Data source

Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.

Read our methodology - how this data is sourced, computed, and verified.

Using STL–RDU data

STL–RDU runs 5 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare STL and RDU airport profiles: delay causes and top routes differ even on the same corridor. STL airport
  • If your dates flex, March (90.2% on-time) beats June (74.2%) on this corridor. Seasonal chart
  • 4 other routes post a similar 84% on-time rate; compare before you commit to this pairing. Similar routes

On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.